Carbon dioxide liquefaction
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I need help. For the industrial production of liquid carbon dioxide, the temperature of the condenser is currently at minus 20 degrees, yet the system pressure remains very high, at 2.4 megapascals – higher than during previous production cycles. This prevents the product from being produced, and electricity consumption is high. Could someone explain why this is happening?
Is it possible that inert gases, such as air, have mixed in?
It shouldn’t, as we transport everything from upstream through pipelines under positive pressure, so it’s impossible for air to get in. The production conditions are the same as before; the only difference is that the purity of the raw gas has dropped from 99.6% to 98.6%. I don’t think this change should have such a significant impact (I don’t have any experience in this area).
What’s different from before is that the purity of the feed gas has dropped from 99.6% to 98.6%. I don’t have any experience in this area, so I’m not sure if this is the reason behind the increase in system pressure due to non-condensable gases, as well as the increased amount of gas that needs to be vented, resulting in higher consumption
Non-condensable gases accumulate over time; a concentration of 98.6% already contains a large amount of such gases. If they are not vented, their quantity will keep increasing as they accumulate inside
But we do have venting, and it’s even more extensive now than under normal conditions
Does venting effectively remove the inert gases? Have any substances that can cause scaling in the heat exchanger been introduced along with the impurities, which would lead to poor heat transfer efficiency and increased difficulties in condensation?
In my opinion, carbon dioxide contains other impurities, which can be attributed to the source from which it comes; it’s also possible that the condenser is scaling up and becoming clogged
Original poster, could you share your liquefaction process and procedures? I am currently studying this area but lack relevant materials. My email address is 530970683QQ.com. Thank you!